Left: fits to the broadband WFC3 phase curve compared to a GCM. The colored lines correspond to different temperature maps fit to the data, and the dashed gray line is from the τdrag4 GCM. We also show the measured planet-to-star flux for each map (points), which is model-dependent due to slight degeneracies with the instrument systematic model. Right: temperature maps from the best-fit models and the GCM at a pressure of 0.1 bar.